Wikidscience - recognize that all objects are composed of atoms

recognize that all matter consists of atom

element- A substance that cannot be broken down by chemical means. Elements are defined by the number of protons they possess.

alkaline earth metal-
An alkaline earth metal is an element belonging to group 2 of the periodic table. The alkaline earth metals, as a group, share charactertic properties

protons- A component of an atomic nucleus with a mass defined as 1 and a charge of +1. The nucleus of a hydrogen atom. The H+ ion.

neutrons-The neutron is the particle in the atomic nucleus with a mass = 1 and charge = 0.

electrons-An electron is a negatively charged component of an atom. Electrons exist outside of and surrounding the atom nucleus. Each electron carries one unit of negative charge and has a very small mass as compared with that of a neutron or proton

electron clouds-The region of negative charge surrounding an atomic nucleus that is associated with an atomic orbital.

atomic number-The number of protons in an element.

atomic mass-Atomic mass or atomic weight is the average mass of atoms of an element, calculated using the relative abundance of isotopes in a naturally-occurring element

mass number-An integer equal to the sum of the number of protons and neutrons of an atomic nucleus.

atomic mass unit-an atomic mass unit or amu is one twelfth of the mass of an unbound atom of carbon-12. It is a unit of mass used to express atomic masses and molecular masses

Arsenic

Atomic Weight

74.9216

Density

5.727 g/cm3

Melting Point

817 °C

Boiling Point

614 °C[note]

Full technical data

Arsenic was the poison of choice until its detection became easy. Combined with gallium it forms a semiconductor used in creating high-speed integrated circuits for supercomputers and cell phones. ||
http://periodictable.com/Elements/033/index.htm

	6	7	8	9	10	11	12	13	14	15	16	17	18
Period
1	1 H																	2 He
2	3 Li	4 Be											5 B	6 C	7 N	8 O	9 F	10 Ne
3	11 Na	12 Mg											13 Al	14 Si	15 P	16 S	17 Cl	18 Ar
4	19 K	20 Ca	21 Sc	22 Ti	23 V	24 Cr	25 Mn	26 Fe	27 Co	28 Ni	29 Cu	30 Zn	31 Ga	32 Ge	33 As	34 Se	35 Br	36 Kr
5	37 Rb	38 Sr	39 Y	40 Zr	41 Nb	42 Mo	43 Tc	44 Ru	45 Rh	46 Pd	47 Ag	48 Cd	49 In	50 Sn	51 Sb	52 Te	53 I	54 Xe
6	55 Cs	56 Ba	*	72 Hf	73 Ta	74 W	75 Re	76 Os	77 Ir	78 Pt	79 Au	80 Hg	81 Tl	82 Pb	83 Bi	84 Po	85 At	86 Rn
7	87 Fr	88 Ra		104 Rf	105 Db	106 Sg	107 Bh	108 Hs	109 Mt	110 Ds	111 Rg	112 Cn	113 Uut	114 Uuq	115 Uup	116 Uuh	117 Uus	118 Uuo

Lanthanoids			57 La	58 Ce	59 Pr	60 Nd	61 Pm	62 Sm	63 Eu	64 Gd	65 Tb	66 Dy	67 Ho	68 Er	69 Tm	70 Yb	71 Lu
Actinoids**			89 Ac	90 Th	91 Pa	92 U	93 Np	94 Pu	95 Am	96 Cm	97 Bk	98 Cf	99 Es	100 Fm	101 Md	102 No	103 Lr

This common arrangement of the periodic table separates the lanthanoids and actinoids (the f-block) from other elements. The wide periodic table incorporates the f-block. The extended periodic table adds the 8th and 9th periods, incorporating the f-block and adding the theoretical g-block. http://en.wikipedia.org/wiki/Periodic_table

IIA

IIIB

IVB

VIB

VIIB

____

VIIIB

____

IIB

IIIA

IVA

VIA

VIIA

VIIIA

1
H
1.01

2
He
4.02

3
Li
6.941

4
Be
9.012

5
B
10.81

6
C
12.011

7
N
14.007

8
O
15.999

9
F
18.999

10
Ne
20.18

11
Na
22.99

12
Mg
24.31

13
Al
26.982

14
Si
28.09

15
P
30.97

16
S
32.06

17
Cl
35.45

18
Ar
39.95

19
K
39.10

20
Ca
40.08

21
Sc
44.96

22
Ti
47.88

23
V
50.94

24
Cr
51.99

25
Mn
54.94

26
Fe
55.85

27
Co58.93

28
Ni
58.69

29
Cu
63.55

30
Zn
65.38

31
Ga
69.72

32
Ge
72.59

33
As
74.92

34
Se
78.96

35
Br
79.90

36
Kr
83.80

37
Rb
85.47

38
Sr
87.62

39
Y
88.91

40
Zr
91.22

41
Nb
92.91

42
Mo
95.94

43
Tc
(98)

44
Ru
101.1

45
Rh
102.9

46
Pd
106.4

47
Ag
107.9

48
Cd
112.4

49
In
114.8

50
Sn
118.7

51
Sb
121.8

52
Te
127.6

53
I
126.9

54
Xe
131.3

55
Cs
132.9

56
Ba
137.3

57
La
138.9

72
Hf
178.5

73
Ta
180.9

74
W
183.9

75
Re
186.2

76
Os
190.2

77
Ir
192.2

78
Pt
195.1

79
Au
197.0

80
Hg
200.6

81
Tl
204.4

82
Pb
207.2

83
Bi
208.9

84
Po
(209)

85
At
(210)

86
Rn
(222)

87
Fr
(223)

88
Ra
226.0

89
Ac
227.0

104
Rf
(261)

105
Db
(262)

106
Sg
(266)

107
Bh
(264)

108
Hs
(269)

109
Mt
(268)

110
Ds
(271)

111
Rg
(272)

112
Cn
(277)

113
Uut
(284)

114
Uuq
(289)

115
Uup
(288)

116
Uuh
(292)

58
Ce
140.1

59
Pr
140.9

60
Nd
144.2

61
Pm
(145)

62
Sm
150.4

63
Eu
152.0

64
Gd
157.3

65
Tb
158.9

66
Dy
162.5

67
Ho
164.9

68
Er
167.3

69
Tm
168.9

70
Yb
173.0

71
Lu
175.0

90
Th
232.0

91
Pa
231.0

92
U
238.0

93
Np
237.0

94
Pu
(244)

95
Am
(243)

96
Cm
(247)

97
Bk
(247)

98
Cf
(251)

99
Es
(252)

100
Fm
(257)

101
Md
(258)

102
No
(259)

103
Lr
(262)

http://www.chemtopics.com/elements.ht
http://www.google.com/

Hydrogen-is a gas in the periodic table

[[@http://www.bing.com/search?q="Silicon+element"&form=SGEWEB|Silicon]]Symbol: Si
State: Solid
Classification: Metalloid
Formation: Primordial
Atomic weight: 28.0855 g/mol
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